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Java 9 Define the multi-resolution image API, developers can easily operate and display images of different resolutions.
The following are the main operation methods of multi-resolution images:
Image getResolutionVariant(double destImageWidth, double destImageHeight) − Get a specific resolution image variant-Represents a logical image of a specific size with known resolution units of DPI and is the best variant.
List<Image> getResolutionVariants() − Returns a list of readable resolution image variants.
import java.io.IOException;
import java.net.URL;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;
import java.awt.Image;
import java.awt.image.MultiResolutionImage;
import java.awt.image.BaseMultiResolutionImage;
import javax.imageio.ImageIO;
public class Tester {
public static void main(String[] args) throws IOException, MalformedURLException {
List<String> imgUrls = List.of("http://www.oldtoolbag.com/wp-content/themes/w3codebox/assets/img/[email protected]",
"http://www.oldtoolbag.com/wp-content/themes/w3codebox/assets/img/w3codebox-logo.png",
"http://www.oldtoolbag.com/wp-content/themes/w3codebox/assets/images/qrcode.png"
List<Image> images = new ArrayList<Image>();
for (String url : imgUrls) {
images.add(ImageIO.read(new URL(url)));
}
// Read all images
MultiResolutionImage multiResolutionImage =
new BaseMultiResolutionImage(images.toArray(new Image[0]));
// Get all the resolutions of the image
List<Image> variants = multiResolutionImage.getResolutionVariants();
System.out.println("Total number of images: ", + variants.size());
for (Image img : variants) {
System.out.println(img);
}
// Get the corresponding image resolution for different sizes
Image variant1 = multiResolutionImage.getResolutionVariant(156, 45);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d], ",
156, 45, variant1.getWidth(null), variant1.getHeight(null));
Image variant2 = multiResolutionImage.getResolutionVariant(311, 89);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d], ", 311, 89,
variant2.getWidth(null), variant2.getHeight(null));
Image variant3 = multiResolutionImage.getResolutionVariant(622, 178);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d], ", 622, 178,
variant3.getWidth(null), variant3.getHeight(null));
Image variant4 = multiResolutionImage.getResolutionVariant(300, 300);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d], ", 300, 300,
variant4.getWidth(null), variant4.getHeight(null));
}
}